To determine how COMET-Farm classifies different tillage event, selecting the small blue question mark to the right of the tillage implementation will show the following table. 
DayCent (the principal model in COMET-Farm) can only handle one implement pass per day. If the user enters two or more in one day, DayCent will only implement the last of the three, ignoring the others that came before it.
Number of passes:
Intensive- COMET assumes 3 passes
Mulch, reduce, ridge, and strip- COMET-assumes 2-3 passes
No Till- assumes 1 pass